3300 CXI II with 4.2 sp1. I've just completed a new, small install today and came across this- when you log into a mailbox everything is ok, but if you hang up and then try to log back in you get message played "that mailbox is busy please try again later" or something very similar. If you leave it for a minute or so you can log back in all ok. And there is also about 1 minute of delay before an MWI lights when a new message is left. I've checked the obvious, there are 16 vm ports, all with the same COS and all 16 are in 1 single VM hunt group. Any ideas what this could be???